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A Further Evaluation of the Coupling Relationship between Dephosphorization and Desulfurization Abilities or Potentials for CaO-based Slags: Influence of Slag Chemical Composition
Yang, Xue Min1; Li, Jin Yan2; Zhang, Meng2; Yan, Fang Jia1; Duan, Dong Ping1; Zhang, Jian3
2018-12-01
Source PublicationMETALS
ISSN2075-4701
Volume8Issue:12Pages:27
AbstractThe coupling relationships between dephosphorization and desulfurization abilities or potentials for CaO-FeO-Fe2O3-Al2O3-P2O5 slags over a large variation range of slag oxidization ability during the secondary refining process of molten steel have been proposed by the present authors as log L-P + 5 log L-S or log CPO43- + log CS2- in the reducing zone and as log L-P + log L-S - 5 log N-FetO or log C-PO4(3-)+ log(CS2-) - log N-FeO in the oxidizing zone based on the ion and molecule 4 coexistence theory (IMCT). In order to further verify the validation and feasibility of the proposed coupling relationships, the effects of chemical composition of the CaO-based slags are provided. The chemical composition of slags was described by three group parameters including reaction abilities of components represented by the mass action concentrations N-i, two kinds of slag basicity as simplified complex basicity (% CaO) / [(% P2O5) + (% Al2O3)] and optical basicity Delta, and the comprehensive effect of iron oxides FetO and basic oxide CaO. Comparing with the strong effects of chemical composition of the CaO-based slags on dephosphorization and desulfurization abilities or potentials, the proposed coupling relationships have been confirmed to not only be independent of slag oxidization ability as expected but also irrelevant to the aforementioned three groups of parameters for representing the chemical composition of the CaO-based slags. Increasing temperature from 1811 to 1927 K (1538 to 1654 degrees C) can result in a decreasing tendency of the proposed coupling relationships. In terms of the proposed coupling relationships, chemical composition of slags or fluxes with assigned dephosphorization ability or potential can be theoretically designed or optimized from its desulfurization ability or potential, and vice versa. Considering the large difference of magnitude between phosphate capacity CPO43- and sulfide capacity CS2-, the proposed coupling relationships 4 between dephosphorization and desulfurization abilities for CaO-based slags are recommended to design or optimize chemical composition of slags.
Keywordphosphate capacity sulfide capacity phosphorus distribution ratio sulfur distribution ratio evaluation of coupling relationship secondary refining process CaO-based slags
DOI10.3390/met8121083
Language英语
WOS KeywordCAO-SIO2-MGO-AL2O3 IRONMAKING SLAGS ; SULFUR DISTRIBUTION RATIO ; LARGE VARIATION RANGE ; SULFIDE CAPACITY ; THERMODYNAMIC MODEL ; PREDICTION MODEL ; CAO-FEO-FE2O3-AL2O3-P2O5 SLAGS ; PHOSPHORUS PARTITION ; LIQUID-IRON ; HOT METAL
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000455072100107
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/27817
Corresponding AuthorYang, Xue Min
Affiliation1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.China Met Ind Planning & Res Inst, Dept Met & Raw Mat, Beijing 100711, Peoples R China
3.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Yang, Xue Min,Li, Jin Yan,Zhang, Meng,et al. A Further Evaluation of the Coupling Relationship between Dephosphorization and Desulfurization Abilities or Potentials for CaO-based Slags: Influence of Slag Chemical Composition[J]. METALS,2018,8(12):27.
APA Yang, Xue Min,Li, Jin Yan,Zhang, Meng,Yan, Fang Jia,Duan, Dong Ping,&Zhang, Jian.(2018).A Further Evaluation of the Coupling Relationship between Dephosphorization and Desulfurization Abilities or Potentials for CaO-based Slags: Influence of Slag Chemical Composition.METALS,8(12),27.
MLA Yang, Xue Min,et al."A Further Evaluation of the Coupling Relationship between Dephosphorization and Desulfurization Abilities or Potentials for CaO-based Slags: Influence of Slag Chemical Composition".METALS 8.12(2018):27.
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